Ammonia is toxic to fish. It is a byproduct of fish waste and it needs to be converted by aerobic nitrification into nitrite and then nitrate and finally into nitrogen gas.
If this does not happen then either the bio-filter in the fishtank or you aquaponics system is not fully matured (not enough beneficial bacteria) or you have too many fish with reference to the biofilter capacity.
The JBL Ammonia Test Kit measures the total amount of ammonia and ammonium quickly and accurately. Sufficient for up to 50 tests and can easily detect 0.5 ppm of total ammonia.
KEEP OUT OF REACH OF CHILDREN. NH3-2 contains mercury salts. If ingested seek immediate medical advise. Keep away from food and feed. Wash hands after using the NH3-2 reagent. Remove any spilled NH3-2 immediately with a tissue and afterwards with water.
If NH3-1 (is caustic) comes into contact with the eyes rinse immediately with plenty of water and seek immediately medical advice. If ingested seek immediate medical advise. If any reagent comes in contact with the skin rinse immediately with plenty of water.